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It seemed everyone who was anyone was at the Los Angeles Convention Center on Monday for the world premiere of "Avengers: Endgame." Most of the folks on the red carpet are in the movie. But there were plenty of A-listers who were just there for a sneak peek. Chris Hemsworth and Elsa Pataky led the red carpet. Click ahead to see who else was there. Jordan Strauss, Invision/AP

It's been more than a decade since the first "Iron Man" film launched the run of 21 Marvel movies that culminates — this phase, anyway — with the fourth "Avengers" release. While theaters have early "Endgame" showings Thursday, the full release is Friday.

Because Captain America, Iron Man, the Hulk and the rest of the gang are going to make quite the ruckus at the box office, a trip to the theater for "Endgame" might come with a few more challenges than usual. Marcus Theatres, the dominant chain in northeast Wisconsin, has offered up some tips for movie-goers heading out this weekend.

► Purchase tickets in advance. With the possible exception of the new "Star Wars" movie coming in December, no 2019 release will have this kind of demand. Theaters are obviously planning for a ton of showings — Marcus Valley Grand Cinema in Buchanan, for instance, has 37 on Friday alone — sellouts are expected.

► Slightly unorthodox showtimes might help. With so many showings planned, it might be wise to try either an early morning or late night time to avoid the biggest crowds. Some showtimes are planned before 8 a.m. and after midnight.

► Get there early. Marcus Theatres reps suggest arriving at the theater at least 45 minutes before showtime. That will leave room in case lines have built up at either the entrance or the concessions and to get settled before the movie starts.

► Know what you're in for. The Marvel blockbusters are known for their lengthy run times, and "Endgame" doesn't buck the trend. The movie is 181 minutes, the first of the 21 Marvel movies to cross the three-hour mark. Ration your food and plan your bathroom breaks accordingly.

► Your Iron Man suit is fine. Just leave the helmet behind. While Marcus Theatres locations are OK with costumes, face-covering masks are not allowed.